It is considered haram
No no not at all im 100% shour. Islam dous not allow to do that
if it is wife or husband YES!
Yes it is allowed as long as she consents.
No Islam does not allow a wife to have more than 1 husband. But if her husband dies or her husband gives divorce, she can marry with another muslim.
no not allow
Yes a Muslim are allowed to do so with his wife for sure. Probably washing your mouth well is a part of "gusul" i.e. a bath to be performed after sex.
Yes you can wife from back in Islam
Yes, it is kind of foreplay allowed oral sex between wife and husband who are licitly married. refer to question below.
This is a crime , a horrible sin......of course no for many reasons & the most important one is that this is considered to be prostitution!!! The wife or the woman in general is not an object to swap !!! Islam have always been in the favour of the woman. It always aims at keeping her dignity & honour, so how it will allow this?
WIFE
NO
one of his wife moved to islam